Pebax/SAPO-34混合基质膜的制备及性能研究  

Preparation and characterization of Pebax/SAPO-34 mixed matrix membrane

作　　者：赵丹[1,2] 任吉中 李晖 张立秋[1,2] 李新学 邓麦村 

机构地区：[1]洁净能源国家实验室,大连化学物理研究所,大连116023 [2]中国科学院大学,北京100049

出　　处：《膜科学与技术》2014年第5期9-15,共7页Membrane Science and Technology

基　　金：863基金资助项目(2012AA03A611);国家科技支撑计划(2011BAC08B00)

摘　　要：选用Pebax1657和SAPO-34为膜材料,分别采用醋酸和1-丁醇为溶剂,通过流延法制备Pebax/SAPO-34混合基质膜(MMMs).研究发现,溶剂能显著地影响膜的结构形态以及渗透性能.纯Pebax膜的气体渗透系数受溶剂的影响较大,而选择性受溶剂影响不大.对于分子筛含量较高(质量分数33%)的MMMs,以1-丁醇为溶剂时,分子筛的分散均匀程度更高,但就材料的成膜性而言,醋酸为溶剂时更好.MMMs中气体渗透系数的变化是结晶度、扩散曲度、链段运动能力和膜形态等因素的共同作用的结果.醋酸为溶剂时,由于相分离的发生,气体的渗透系数出现突跃,最大提高到纯Pebax膜的3倍.1-丁醇为溶剂时,除H2外,气体渗透系数先出现一定程度的提高,而后由于受到链段僵化以及扩散曲度的影响而降低.Poly（amide-6-b-ethylene oxide）（Pebax1657）and SAPO-34 were used to prepare Pebax1657/SAPO-34 mixed matrix membranes（MMMs）by solution-casting method with 1-butanol and acetic acid as solvent respectively.It was found that the casting solvent had more influence on permeability rather than selectivity.The MMMs prepared with 1-butanol had better zeolite distribution at high zeolite content,but the better membrane-forming was belonged to that prepared with acetic acid.The change of permeability was the co-effect of crystallization,diffusivity tortuosity,mobility of polymer chain and membrane morphology.When acetic acid was used,due to the phase separation,the permeability showed a jump and maximum reached 3fold of the pristine Pebax membrane,and when 1-butanol was used,except for H2,the permeabilities of other gases increased initially and then decreased as a result of chain rigidification and increased diffusivity tortuosity.

关 键 词：Pebax 混合基质膜 溶剂 

分 类 号：TQ051.893[化学工程]